EP2130336B1 - A method by a station configured to become a master station of a wireless personal area network, corresponding apparatus and system - Google Patents

A method by a station configured to become a master station of a wireless personal area network, corresponding apparatus and system Download PDF

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Publication number
EP2130336B1
EP2130336B1 EP08799739.1A EP08799739A EP2130336B1 EP 2130336 B1 EP2130336 B1 EP 2130336B1 EP 08799739 A EP08799739 A EP 08799739A EP 2130336 B1 EP2130336 B1 EP 2130336B1
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EP
European Patent Office
Prior art keywords
master station
association
wpan
stations
station
Prior art date
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EP08799739.1A
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German (de)
English (en)
French (fr)
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EP2130336A1 (en
EP2130336A4 (en
Inventor
Olga Adamovsky
Maxim Grabarnik
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Intel Corp
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Intel Corp
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Publication of EP2130336A4 publication Critical patent/EP2130336A4/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • a personal area network is a computer network used for communication among computer devices (for example, telephones and personal digital assistants) close to one person. The devices may or may not belong to the person in question. The reach of a PAN may be a few meters. PANs may be used for communication among the personal devices themselves (intrapersonal communication), or for connecting to a higher level network and the Internet (an uplink). Personal area networks may be wired with computer buses such as universal serial bus (USB) and FireWire.
  • a wireless personal area network may use wireless network technologies such as, for example IrDA, Bluetooth and wireless technologies that define in IEEE 802.11 standard, 1999.
  • US 2006/0106963 discloses a CPU core which randomly sets a master device search period, whereby the CPU core may act as a temporary master once the search period ends.
  • US 2005/221897 discloses a game system including a slave and master machine and a process of lengthening a frame cycle.
  • US 6 842 460 B1 discloses a method for an ad hoc network between short range wireless devices, wherein a device may assume the role of an ad hoc information provider for the new piconet.
  • US 6 332 077 B1 discloses a roaming algorithm for associating a mobile station with an access point in a wireless LAN system used in an automatic guidance vehicle application.
  • a station configured to become a master station of a wireless personal area network as set out in claim 1, a wireless communication device as set out in claim 8 and a wireless communication system as set out in claim 15.
  • Types of WLAN stations intended to be within the scope of the present invention include, although are not limited to, mobile stations, access points, stations for receiving and transmitting spread spectrum signals such as, for example, Frequency Hopping Spread Spectrum (FHSS), Direct Sequence Spread Spectrum (DSSS), Complementary Code Keying (CCK), Orthogonal Frequency-Division Multiplexing (OFDM) and the like.
  • FHSS Frequency Hopping Spread Spectrum
  • DSSS Direct Sequence Spread Spectrum
  • CK Complementary Code Keying
  • OFDM Orthogonal Frequency-Division Multiplexing
  • wireless communication network 100 may be WLAN and/or WPAN or the like.
  • wireless communication network 100 includes the WPAN.
  • the WPAN may be defined by IEEE 802.15-2002 standard, and includes an association 110, association 120 and a WPAN Master device 150.
  • Association 110 may include stations 112, 114 and 116
  • Association 120 may include WPAN Master 150 and stations 112, 122 and 124.
  • a station of the WPAN may include, but not limited to, a projector, a laptop computer, a printer, a cell phone, a handheld device, an access point of WLAN or the like.
  • stations 112, 114 and 116 are laptop computer and may include a WPAN master capabilities and/or WLAN client and/or WPAN client capabilities.
  • Station 122 may be a projector and station 124 may be a voice recorder. According to this example, stations 122 and 124 may not include WPAN master capabilities.
  • WPAN Master device 150 may also includes WLAN client capabilities and may operate as WLAN station, if desired.
  • a group of people that want to share WPAN devices and materials during a meeting may create WPAN session.
  • WPAN Master device 150 may be selected to host a communication WPAN sessions.
  • WPAN session may create between WPAN devices 112, 122, 124 and PAN master device 150, although the scope of the present invention is not limited to this example.
  • the WPAN session may be a sub network of the WLAN 100.
  • WPAN master station 150 may advertise his WPAN capabilities by sending beacons that include WPAN capabilities information element (IE).
  • the WPAN capabilities IE may include a service set identifier (SSID) and session ID.
  • SSID service set identifier
  • the pair ⁇ SSID, session ID> may uniquely identify the WPAN session within WLAN 100, if desired.
  • the session ID may include the PAN master device system clock value on WPAN session creation (e.g., WPAN master device 150 and stations 112, 122, 124).
  • WPAN master device 150 e.g., a laptop computer
  • Station 112 that includes WPAN master capabilities may detect that WPAN master device 150 became unavailable and becomes a new WPAN master device.
  • Stations 114, 116, 122 and 124 may establish a connection with station 112 as the new WPAN master device and create a new WPAN session.
  • the new WPAN session may be defined by the SSID of WLAN 100 and the session ID, which includes value of the system clock of station 112 at the time of the WPAN session creation, if desired.
  • the new WPAN Master device may activate a WPAN master station application to become the new WPAN master station and send one or more beacons to notify the one or more stations (e.g., stations 114, 116, 122 and/or 124) of the one or more sessions on the new WPAN master station connectivity parameters, if desired.
  • wireless communication device 200 may able to operate as a WLAN client and/or as a WPAN master device.
  • wireless communication 200 may include an antenna 210, a receiver (RX) 220, a transmitter (TX) 230, a detector 240, a comparator 250, a controller 260, a master station module 270 and a system clock 280.
  • antenna 210 may include a dipole antenna, an internal antenna, a Yagi antenna, a monopole antenna, an antenna array or the like.
  • Antenna 210 may receive signals from one or more stations of a WLAN and/or WPAN association(s).
  • RX 220 may demodulate the received signals and detector 240 may detect that a WPAN master station of the association becomes unavailable. For example, if WPAN master device 150 becomes unavailable because the WPAN master device left the association, the WPAN master device is in a standby mode and does not transmit beacon or receive signals or the like.
  • detector 240 may detect that other master stations operate on the association and may send a detect signal to controller 260, for example, which may include a medium access controller (MAC), if desired.
  • MAC medium access controller
  • controller 240 may send a signal to master station module 270 to activate a master station application.
  • the activation of the master station application may cause wireless communication device 200 to become a master station.
  • master station module 270 may activate TX 230 to send one or more beacons to notify the one or more stations of the association on connectivity parameters of the master station.
  • the connectivity parameters may include the SSID and the session ID.
  • the session ID may include a value of system clock 280 and the time of WPAN session creation, if desired.
  • RX 220 may receive a connection request signal from the one or more stations of the association in order to reestablish a connection with the one or more stations of the association.
  • RX 220 may receive timing synchronization function (TSF) values from the others master stations (e.g., station 112).
  • TSF timing synchronization function
  • Comparator 250 may compare the TSF values of at least one other master station with an internal TSF value and send the comparison result to controller 260.
  • Controller 260 may activate or deactivate master station module 270 according to the comparison result.
  • controller 260 may permit one of the other stations to become the master station.
  • Controller 260 may annex one or more associated stations to the new master station, if desired.
  • controller 260 may annex the one or more associated stations by reporting to the new master station the associated stations, preventing from the unassociated stations to join the association and disconnecting the one or more associated stations from the current master station, becoming a WPAN client of the new master station by establishing a connection with the new master station as the client.
  • controller 260 may annex the one or more associated stations by informing the one or more associated stations about the new master device and triggering the one or more associated stations to roam to the new master device, if desired.
  • FIG. 3 a schematic illustration of a state machine diagram of a recovery scheme of connection maintenance of WPAN in a case of WPAN master device unsolicited unavailability according to exemplary embodiments of the invention of the present invention is shown.
  • WPAN session may include WPAN master device 150 and stations 114, 116, 122 and 124.
  • WPAN master device is denoted as Z.
  • the master device Z may leave the session.
  • Client X may detect that the master device Z became unavailable and may search for other WPAN master devices in the WPAN session ⁇ S1, S2> (state 320). If client X finds other WPAN master devices, client X may joint the WPAN session ⁇ S1, S2> as a client (state 310). If client X does not find alternative WPAN master device, client X may become the new WPAN master device of WPAN session ⁇ S1, S2> (state 330).
  • the new WPAN master device may start to send beacons applicable to WPAN session ⁇ S1, S2>.
  • the new WPAN master device may start its timing synchronization function (TSF) values from 0.
  • TSF timing synchronization function
  • client X may become the new WPAN master on the same channel of the previous WPAN master device.
  • client X at state 330 may detect other masters of WPAN session ⁇ S1, S2>.
  • Client X may perform a lead election algorithm to decide whether it should remain the new WPAN master, or should join another master as a client (state 340).
  • a lead election algorithm may include analyzing the TSF values of the other WPAN master devices and electing the WPAN master with the biggest TSF to lead the WPAN session, if desired. If other WPAN master device is elected to lead the WPAN session, client X may annex and merge with a WPAN cell of the elected WPAN master device Z.
  • annexing may be executed by a WPAN client that became WPAN master device X (e.g., station 112) and let another WPAN master device Y (e.g., station 116) to take the lead.
  • the WPAN master X may establish a WPAN cell (also may be referred as association) with other WPAN stations (e.g., stations 122 and 124).
  • the WPAN master X may inform clients of the WPAN cell (e.g., stations 122 and 124) about the new WPAN master device (e.g., WPAN master Y), for example station 116.
  • the WPAN master X may send to the new WPAN master device a list of clients and their capabilities using wireless domain services (WDS) traffic, if desired.
  • WDS wireless domain services
  • the WPAN master X may trigger the new WPAN master device to query the WPAN client about the clients that are associated with it.
  • the WPAN master device X may disconnect associated WPAN clients (text box 410).
  • the WPAN master X may prevent other WPAN clients (e.g., client 114) from establishing a connection with him (text box 420).
  • the new WPAN master device Y e.g., station 116) may perform a connection establishment procedure with the WPAN stations of the WPAN cell (text box 430).
  • the WPAN master device X may detect that the stations of the WPAN cell are no longer connected to him (text box 440), although the scope of the present invention is not limited in this respect.
  • a WPAN client e.g., station 112 may inform WPAN clients of a WPAN cell (e.g., stations 122, 124) about the new WPAN master device (e.g., station 116), as is shown in text box 510.
  • the WPAN client may trigger WPAN clients of its WPAN cell (e.g., station 122, 124) to roam to the new WPAN master device (text box 520) and to roam to the new WPAN master device (e.g., station 116), if desired.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
EP08799739.1A 2007-03-28 2008-03-25 A method by a station configured to become a master station of a wireless personal area network, corresponding apparatus and system Active EP2130336B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/727,724 US8401001B2 (en) 2007-03-28 2007-03-28 Method and apparatus of connectivity recovery in wireless network
PCT/US2008/058153 WO2008121621A1 (en) 2007-03-28 2008-03-25 Method and apparatus of connectivity recovery in wireless network

Publications (3)

Publication Number Publication Date
EP2130336A1 EP2130336A1 (en) 2009-12-09
EP2130336A4 EP2130336A4 (en) 2013-02-20
EP2130336B1 true EP2130336B1 (en) 2017-04-19

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US (3) US8401001B2 (ja)
EP (1) EP2130336B1 (ja)
JP (2) JP5015271B2 (ja)
KR (1) KR101098705B1 (ja)
CN (2) CN102984790A (ja)
BR (1) BRPI0809344A2 (ja)
RU (1) RU2435333C2 (ja)
WO (1) WO2008121621A1 (ja)

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JP2010520731A (ja) 2010-06-10
RU2435333C2 (ru) 2011-11-27
US20130203354A1 (en) 2013-08-08
JP5429831B2 (ja) 2014-02-26
US8401001B2 (en) 2013-03-19
CN101647243A (zh) 2010-02-10
WO2008121621A1 (en) 2008-10-09
JP5015271B2 (ja) 2012-08-29
EP2130336A1 (en) 2009-12-09
US8903318B2 (en) 2014-12-02
US20080240145A1 (en) 2008-10-02
KR101098705B1 (ko) 2011-12-23
RU2009134233A (ru) 2011-03-20
KR20090123923A (ko) 2009-12-02
CN102984790A (zh) 2013-03-20
EP2130336A4 (en) 2013-02-20
CN101647243B (zh) 2013-01-02
US20150055601A1 (en) 2015-02-26
BRPI0809344A2 (pt) 2014-10-07
JP2012199992A (ja) 2012-10-18

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